References for Revelation 15:1

2
And I saw as a glass sea, mingled with fire, and those that had gained the victory over the beast, and over its image, and over the number of its name, standing upon the glass sea, having harps of God.

3
And they sing the song of Moses bondman of God, and the song of the Lamb, saying, Great and wonderful [are] thy works, Lord God b Almighty; righteous and true [are] thy ways, O King of nations.

References for Revelation 15:4

Ú15:4 -
Hosios, not hagios. It is used for mercy, grace, and of Christ, as the One in whom all gracious qualities are concentrated. (Ps. 89.1,2,19.) In men it means piety and uprightness. Chesed is so translated in the Old Testament. It is in general the sum of qualities which suit and form the divine character in man, as opposed to the human will: what God gives as consistent with himself, his character, and promise. The 'sure mercies' of David is expressed by this word in the LXX, Isa. 55.3; Acts 13.34. God alone possesses the qualities which entitle him to worship as a pious man would understand it. Hosios is used in this general way for 'holy:' see Note i, Heb. 7.26.